水下单层薄金属板多格角反射体声散射特性研究

Acoustic Scattering Characteristics of Underwater Multicell Single-layer Thin Metal Plate Corner Reflectors

为了使水下角反射器在较大空间范围内都具有一定的目标强度,应考虑采用多个角反射器组合成多格角反射体,以达到增大散射范围的目的。基于此,采用有限元结合边界元法(FEM-BEM),对水下单层薄金属板多格角反射体声散射特性进行了数值仿真计算,分析了声波入射频率为5.0kHz~15.0kHz范围内,平板材料、平板厚度、入射角度、角反射器组合类型等因素对目标强度的影响。结果表明,水下单层薄金属板多格角反射体具有较强的频率特性;平板材料、平板厚度以及角反射器组合类型的变化会对多格角反射体目标强度产生较为明显的影响。研究结果为水下多格角反射体的设计使用提供了仿真依据和数据支撑。

In order to make the corner reflector have a cetarin TS in a large space,multiple reflectors should be considered for combination to achieve the purpose of increasing the reflector scattering width.The scattering acoustic field of underwater multicell single-layer thin metal plate corner reflectors in far field is simulated by using FEM coupled BEM.The influence of incident wave frequencevaries from 5.0kHz to 15.0kHz,plate material,thickness,incident angle and combination type on TS is analyzed.The re-sults show that the scattering acoustic field of underwater multicell single-layer thin metal plate corner reflectors has a strong fre-quency characteristic.As the plate material,thickness,incident angle and combination type changes,so does the TS.The results pro-vide a simulation basis for the design and application of the underwater multicell single-layer thin metal plate corner reflectors.